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(A) In a $P-N$ junction diode,the depletion layer (or depletion region) is formed due to the diffusion of charge carriers across the junction. This re

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$0.5$ $\mu$m

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(A) In a $P-N$ junction diode,the depletion layer (or depletion region) is formed due to the diffusion of charge carriers across the junction. This region is characterized by the absence of mobile charge carriers. The width of this depletion layer is typically in the order of $10^{-6}$ meters,which is equivalent to $1$ $\mu$m. Specifically,for most standard semiconductor diodes,the width of the depletion layer is approximately $0.5$ $\mu$m.

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